<!DOCTYPE html>
<html>
<head>
<script>

function boom()
{
  document.documentElement.offsetHeight;
  document.getElementById("outer").lastChild.data = "Y";
  document.documentElement.offsetHeight;
}

</script>
</head>
<body onload="boom();">
<div id="outer" style="-moz-column-width: 1px;"><div style="-moz-column-width: 1px;"><div style="height: 50px;"></div><div style="float: left; height: 466px;"></div><div></div></div>X</div>
</body>
</html>
